Lonely Spoon Obs has 50mm thick foam insulated walls. When open, the dome room quickly achieves ambient temperature as it just doesn't heat up much.
On a hot (35+) summer day the inside is around 25 degrees when I go in.
In winter the dome room can be only 4-5 degrees but the control room will be around 12 with me in it. I've considered gifting myself a small heater.
Nothing wrong with insulated walls IMHO.
Cheers,
Neville
LSO
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